Sawmill carriage



March 4, 1930.

G. M. PELTON 1,749,109

SAWMILL CARRIAGE 2 Sheets-Sheet 1 Filed March 19, 1929 March 4, 1930. G.M. PELTON SAWMILL CARRIAGE Filed March 19, 1929' 2 Sheets-Sheet 2 dam/M4I of the dogs when pro ected their maxnnum' o, Theretore, it'isthe'pr'im'ary Patented Mar. 4,1930 1 P TENT OFFICE GEORG ivnrntron, OFMILWAUKEE; WISCONSIN, ASSIGNOR To THE FILER & STOWELL so, or MILWAUKEE,WISCONSIN, A coEronArIon OF WISCONSIN SA MIL CARRIAGE fApplica tion megMar-ch19, 1929. Serial No. 348,322.

'jection beyond theiace' of the knee or a,

' maximum projectionjbeyond the face or the 'knee,'the position of thedogs beingmanually coi'itrolled and adjusted at will to suit theparticularconditions of dog use. Obviously, 15 Where the dogs arecapable of minimum or maximumprojection beyond'the face of the pknee,an'y means to limit the movementot the 1 1 1 dogs toward thesawfline to therebyprevent the. dogs (from entering "the saw line must20 take into consideration theditlerent relative positions of thedogsrelative to the face of the knee, fonif the 'knee was interrupted inits "travel toward the saw line/soasto prevent thefdog's' at theirminimum projection the'dogs, when projected to their maximum degreewouldreach the saw line before the fforwardmovement of the knee wascomplete- 1y interrupted; gConversely, 1 if the knee in{ terruption wasprovided for to take care distance beyondthe face of the knee, the kneetravel wouldbestopped long before the dogs when at their minmimulnprojection could "take care or" both conditionsr Heretofore, the dogsand the 7 means of'th'e typeto which this invention is se'ntialfdogoperating elements and the dogs 'broughta'bout the-necessity ofprovidingimmum; or minimum position.

7 enter; the saw line. Thus, no positive stop "cooperating with-the kneealone can properly d g n i directedhav'e been mounted, onthegoutside ofthe knee, but it has been found {desirable to so construct the parts asto'mount' tl1e eswithin theqkn'ee. I'Ihis arrangem'ent has object of thepresent invention to provide a stop for the movement ,Of'the dogs towardthe saw line,

which stop, when in operation, interrupts the movementsof the dogstoward the saw line and holds the points of the dogs fixed or stationarywithout interrupting the movement of the knee. The knee under thisconstruction will continue to move forwardto its normal limit stop whilethe dogs, being interrupted by the stop of this invention, will beproportionally withdrawn back into the knee asthe knee advances.

The'invention is illustrated in the accompanying drawings, in which:

Figure 1 is a view insideelevation showing the knee provided withtheimproved adjustable limit means.

Figure 2 1s a perspective view showing the llmit means connected to theguide rod for the unit support-and adjustment of the dogs.

Figure 3 is a view infr'ont elevation of the kneefequipped with thelimit means.

Figure 4 is a similar view showing a slight I modification. frombe1ngengaged by the saw, obvlously Figure 5 is aview in elevation, partly in,section, of aslightly modified form of the invention.

The improved dog limiting means is designed particularly'for use in thattype of dogging mechanism whereinone or more dog units are mounted uponaguide bar 1 which is adjustable with respect to the face of the knee totherebyicau'se the operating points of the dogs to project toa' minimumor maximum distance beyond the face of the knee, in order to 'cooperatewithfla particular type of material, such mechanism, for example, beingshown in anja'pplication filed by me May 19.

1927, Serial No. 192,723.

In t-he'form illustrated in Figures 1, 2 and s 3, this guide'bar whichis arranged within theknee, is connected adjacent its upper and lowerends tocranks 2 operating wholly witl1- ment through a bar 6. One of thearms 5, as I the upper one, is connectedto the piston rod' 8 of a pistonoperative in a cylinder 9 and constituting a motor mechanism to besuitably controlled by the admission of a pressure medium to turn thecranks 2 on their pivotal supports and thereby move the bar 1 and thedog units toward and from the face of the knee to provide for minimum ormaximum projection of the dogs relative to the face of the knee.

- In theform illustrated in Figures 1, 2 and:

3, the arms 5 are pivotally supported on theknee and the cranks 2 areconnected to the bar 1 by crank pins 10 operating through an arcuateslot 11 in the side of the knee to permit'the play of the lower pin 10in the adjustment of the guide bar.

The stop mechanism includes anabutment or stop 12 mounted on the headblock in the path of movement of a hook or lug'13at the free end of abar 14:,the opposite end'of which is connected at 15, to the'outer-end'of lower crankpin 10, outside of the knee. For convenience, a portionof'the bar 161 adjacent and including the hook orlug 13 is projected. in

parallelism with th'eiplane of movement of thelknee, the remaininglength of the bar Y being inclinedupwardly leadingto its connection at15. If desired'and'j as preferred, the straight portion of'the bar 11restsiin a guide 16 carried on the knee to preventdisplacement'of thisbar while approaching and I during its engagement with the limiting stopIn the form of the inventionshown in Fig- 'ure 4, the lower crank2 ofthepreferred form is rigidly connectedjto the crank shaft 22but itscrank pin 23, which formsthe pivotal connection with the guide bar 1,does notextend' through the side of the casing. Talieuj-of the pivot pinforming the connection for, the

bar 1 1,1 mount a sleeve 2 1,011 the shaft 22,

from which, outside of the knee, extends an arm or lever 25 andat-the'outer end thereof is a pivot pin 26 in alignment with the crankpin 23, conneotingthe crank 2 to the guide bar 1. To the pivot pin 26 ispivotally connected theend of the bar 14. N

The operation of both formsis identical,

in so far as the'dog limiting means is concern'ed. In this connection,attention is called to the factthat the usual head'blockis provided withfrontstop 20 which is engaged by the knee stop 21in themovementtherebfand positively limits the-kneein its advance nism 9, the guide bar' 1 isadjusted so as to" set the dogsfor the maximum'or minimum projectionbeyond the face of theknea If.

this guide bar has been adjusted for the minimum projection of the dogs,for example, it

' is apparent that should the knee, in its movement toward the saw line,move the dogs into the path of the saw before the knee reached itsforward limitstop, damage to the saw and danger-to the operators wouldundoubtedly ensue.' With the guide bar 1 adjusted for such minimumdogprojection, however, it

will be noted that bar 14 is -corre'spondingly moved rearwardly' withrespect to the-face of the knee and to an extent in exact accordancewith the adjustment of the guide bar.

Therefore, thehook or lug 13 of the bar 14 is movedfarther from the faceof the knee and hence the knee is permitted a definite ;ad=

vance movement toward-the saw line before. the hook or lug 13 engagesthelimit stop,12.

If the guide bar 1 hadbeen adjusted by' the. motor mechanism 9 to .anadvance position, thereby providing for the maximum projection of thedogs, itis apparent that the bar 14 and'hook 18 will,be' correspondinglyad vanced toward the face of the knee in direct;

accordancewith the dog adjustment and that,

therefore, in the advance of the knee, thehook 13 wouldengage'thestoplZatadefinitepointf; 7 if in the advance of, the knee, but, of.course, at

a point farther removed fromthe'saw line. than where the dogs hadlbeenprojected onlag i to their minimum'distanceas in' the instance. 7 above:noted' As the knee advances, the,

hook 13 engages the stopl2 atthe partijcul'ar a predetermined positionwhich that'posig tion at which the dogs, whether in advancedfflretracted orintermediate position, have not yet reached the saw line} 1This engagementg ofthe hook 13and stop 12arrests the-forwardfmovementof' the guide bar with the knee, l

that is to say the vguide barficannotf advance p with the knee while thelatter is not inter-.

rupted because it has not yetreached itsown limit stop on the headblock. a ing of'the unitmovementof the guidebar and knee, there ,is arelative movementproduced. between these parts, that. is the guide.bar'isf held stationary while the knee"; continues to By thisarresti-j.

advance. This will, of. course,.immediately I V efl'ect a withdrawingoperation of the dogs, that is the dogs will'be graduallylwithdrawn intotheknee. as .th e knee rcontinues its ad-v Vance toward the saw line, i

.Merely for illustrative.puiiposes wewill;

assume that fthe knee stopjonthe headgblock interruptsthe movement, ofthe knee while the face of the kneeis oneinfchfrom; the saw:

line. We will further assume that. the eX- 'treme restricted or, minimumposition of; the: dogs.isthreerquarters of an inch in advance 7 of theface of the. knee andthat their maxi mum projectionmaybe anything fromthree to five inches: in accordance with the, work] being handled. Withthe knee advancingthe log toward the saw lineand the dogs,say,

.p ojectedfourand one-half inchesbeyond th e leaf face of the knee, therelation of the parts is "such that the hook 13 will engage the stop 12when the free ends of the dogs are, say, onequarter of an inch from thesaw line.: Obviously, the dogscannot advance beyond this limit while theknee may continue to move ';to a position withinone inch of the sawline;

After the movement of the dogs has been interrupted by the cooperationofthe hook 3' gradually reducing the distance between the free ends ofthe dogs and'the knee until, when.

13 and stop 12, and the knee continues to ad- 'vance, the dogs aregradually retracted relative to the face'of the knee, that is the kneeadvances toward the free ends of'the dogs,

, the knee reaches itslimit stop, the dogs will have beenwithdrawn intothe knee to leave the minimum dogprojection, three-quarters of an inchin the particular instance cited, and still one-quarter of an inch fromthe saw line. Thus, as the parts reach their minimum spaclng from thesaw, where in the instance cited, the knee is stopped oneinch from thesaw line and the dogs are projected threequarters of an inch beyondthe'face of the T parent that with idle knees, that is those knees "ofthe carriage with which the log is not engaged, the idle'dogs will begradually withdrawn into the knee as the knee advances to therebyprevent the dogs from encroaching on the saw line. ,Withthose knees inwhich the dogs are actually engaged inthe log, the

' stop is of course equally as effective. 'In these 9 in the log, theautomatic stop will serve to 7 prevent further advance of the dogstoward instances, however, the dogs being embedded the saw lineand'under these circumstances,

I c if the stop became efiective during the travel of the knee towardthe saw line, the effect of the stop in themovement of the dogs would beinterrupted and the dogs freed from the log. The stop, would'of coursefunction as a stop in connection with the dogs on those I 6' knees withwhich the log'was engaged as well aswhere the dogs were idle, so thatfor the purpose of thewinvention, the stop is completely effective toprevent the dogs reaching the saw line and this whetherthe particulardogs are idle or engaged in a log.

I am aware of the dog stopping mechanism disclosed in the'applicationfor patent of G.

Schnell, Serial No; 156,667, filed December 23, 1926, and make no claimbroadly to mechanism for preventing dogs movable to a maxi- .mum andminimum distance from the knee, contacting with a saw, but rather to theparticular character of the structure herein Theinvention as appliedshown and described to enclosed dogs and enclosed dog operatingmechanism of the type described effectually precludes a setterprojecting'the dog's intothe path of the saw. By connecting the limitingbar 14: to the pivotal connection 15 between the crank and the movableguide bar 1,;the lug 13 and stop 12 are at. all times in such-relativeposition as will insure of the movement of the dogs being limited toprevent them passing over the saw line. 1 f y In Figure 5 there is showna somewhat modified form of the invention wherein the guide bar, similarto the guide bar 1 of the first form, and here indicated at 27, isconnected to the down-turned arms 28 of cranks 29 mounted and operatingwithin the knee. These cranks have rearward projections 30 connected forsimultaneous movement by a bar 31. The upper crank extension 3O isconnected to the piston of the power means, as in the preferred form.The down-turned extension 28 of the lower crank is, in theformillustrated in Figure 5, projected beyond the connectionof suchextension and the guide bar 27 to form a crank arm 32, the lower end ofwhich depends below the knee and moves in the path ofa stop 33 securedon the head block at an appropriate point in the travel of thekneetoward the saw line. Front and rear adjustable stops 34 and 35 aremounted maximum or minimum positions.

y In effective operation, the form illustrated in Figure 5,'in so farasthe control of the dogs is concerned, is identical with the form shownin Figure 1; that is'to say, with the dogs projected to their maximumposition, the crank arm 32 will occupy the position shown in full linesin Figure-5. WVith the dogs in this; advanced position and the kneemoving toward the saw line, it will be apparent that iflsuchrelation ofparts and continued movement of theyknee is permitted, the dogs wouldcross the saw line before the knee met the usual fixed stop provided onthe head block and indicated at 20in Figure'l. WVith the crank arm 32 inthe'position indicated in full lines in Figure 5, it is understood thatsaid arm would engage the stop 33 before the knee engages the stop 20.,Therefore, as the c knee continues to advance, it will be apparent thatthe cranks 28, by reason of the cooperation of the arm 32 and stop 33,will be swung rearwardly, moving the dogs from their maximum advancedposition toward and eventually intotheir minimum advanced position.

/Vith the dogs in their minimum advanced position, the arm 32 of thecrank is in the position indicated in dotted lines in Figure 5, andunder these circumstanceswill engage the stop 33' simultaneously withthe engagement of the knee stop 2lcwith the head block stop 20. It is ofcourse understood that in the minimum projected position of the dogs,the knee is interrupted in its forward movement bycoop'eration of itsstop 21 with the headblock stop 20 (as shown in Figure 1) before thedogs in such minimum projected position can reach the saw line. I Thefront and rear stops 34 and 35 for the cranks, it being understood thatsuchstops are provided for both the upper and lower cranks, have animportant function in' con nection with this type of apparatus. It willbe appreciated that When the dogs are in maximum projected position, thecrank arms '28 connected to guide bar 27 heair squarely in Contact withthe forward stops 3 4. This insures a firm, rigid'hearing point for thecrank, relieves the power means ofall strain, revents any poss bility oflost motion- 11i the ol aeratin'g' parts, and thereby insures more ingand knee to permit movement of -the perfect lumber i'n the cuttingoperation. With the dogs in their minimum pibjeGted position, the crankextensions 28 engage the reel stop35, with the seine efiect as in theengagement with the forward stop in so far as relieving the power meansof stra n and.

"preventing lost. motion in the parts.

This applicatoin isin part a continuation of my application filed No;194 1 84,

VVhat is claimed to be new-is 1. In a saw mill carriage, a-kriee, a dogI mounti g ,eran1:s connecting the dog mountmounting toward the face-ofthe knee, dogs carried by therrmaunting a's'top on the ean r'iege andanarm formin a rigid extension of one of the cranks and adapted todependin the path of the stop when the dogs are projected totheir'maximum extent."

2 In a saw mill carriage, ek'nee', nug

i mounting, cranks connecting the dogjmoune and knee to permit movementof the mounting toward and from thefe'ce of the knee, dogs "carried bythe mounting, a stop on the carriage, and an arm'form'ing an extensionof one of the cranks and adapted to depend inthe path of the stop and toengage said stopin'the movement of the knee toward the saw line tothereby limit the further movement of the dogs toward the saw lineWithout interfering'with the movemen or the knee.

' In testimony whereof I aflifzi my signature.

. M. PELTON.

May 25,1927, Serial.

